next step: create image through the api after drop image on gallery.

app/controllers/admin/api/v1/images_controller.rb

@@ -0,0 +1,3 @@
+class Admin::Api::V1::ImagesController < Admin::ApiController
+end
+

app/models/gallery.rb

@@ -8,8 +8,8 @@ class Gallery
   # Fields
   field :title, type: String
 
-  embeds_many :images
-  accepts_nested_attributes_for :images, allow_destroy: true
+  embeds_many :items, class_name: 'GalleryItem'
+  accepts_nested_attributes_for :items, allow_destroy: true
 
   # Validations
   validates :title, presence: true

app/models/gallery_item.rb

@@ -0,0 +1,11 @@
+class GalleryItem
+  include Mongoid::Document
+
+  field :title, type: String
+  field :description, type: String
+  field :image, type: String
+
+  embedded_in :gallery
+
+end
+

config/routes.rb

@@ -6,6 +6,7 @@
   namespace :admin do
     namespace :api do
       namespace :v1 do
+        resources :images, only: [:create]
         resources :markdown, only: [:create]
         resources :posts, only: [:index, :create, :update, :destroy]
         post '/spellchecker/check', to: 'spellchecker#check', as: 'spellchecker'

spec/controllers/admin/galleries_controller_spec.rb

@@ -8,22 +8,20 @@
   context 'on save gallery with image list' do
 
     let(:gallery_attributes) {FactoryGirl.attributes_for(:gallery)}
-    let(:gallery_with_image_attributes) do
+    let(:gallery_with_image_attributes) do 
       gallery = FactoryGirl.attributes_for(:gallery)
-      gallery['images_attributes'] = [FactoryGirl.attributes_for(:image)]
-      gallery['images_attributes'][0]['file'] = Rack::Test::UploadedFile.new(
-        image_example_path, 'image/jpeg')
+      gallery['items_attributes'] = [FactoryGirl.attributes_for(:gallery_item)]
       gallery
     end
 
     it 'create empty gallery' do
       post :create, gallery: gallery_attributes
-      expect(assigns(:gallery).images.size).to eql 0
+      expect(assigns(:gallery).items.size).to eql 0
     end
 
     it 'create with image' do
       post :create, gallery: gallery_with_image_attributes
-      expect(assigns(:gallery).images.size).to eql 1
+      expect(assigns(:gallery).items.size).to eql 1
       expect(response).to be_redirect
     end
 

spec/factories/galleries.rb

@@ -4,7 +4,7 @@
     title Faker::Commerce.product_name
 
     factory :gallery_with_image do
-      images {build_list :image, 1}
+      items {build_list :gallery_item, 1}
     end
 
   end

spec/factories/gallery_items.rb

@@ -0,0 +1,9 @@
+FactoryGirl.define do
+
+  factory :gallery_item do
+    title Faker::Commerce.product_name
+    description Faker::Lorem.paragraph(2)
+  end
+
+end
+